The detection methods of heat exchangers are various, and the detection requirements of heat exchangers are increasing year by year. However, the main problem now is that the detection unit capable of mastering such heat exchanger detection technology is rare. Therefore, if more inspection units can understand and master this technology, we will inevitably make the heat exchanger detection application more widely popularized and used.
The multi-technology combination method can be used to detect heat exchange tubes of different materials and structures and shapes, regardless of whether there is a heat sink or not. The detection is mainly for in-service inspection, the detection is fast and efficient, and the defects can be analyzed in detail, and the overall image of the 3D heat exchange tube is produced. For situations where data storage records are not required, more portable devices can be used for eddy current detection (ECT), as well as far field detection (RFT) and near field detection (NFT), and clearing and balancing can be done with a foot switch. work.
Far field detection (RFT) technology is currently being successfully applied to the inspection of tubular materials such as carbon steel or ferritic stainless steel. This technology provides excellent sensitivity in detecting and measuring volumetric defects originating from erosion, corrosion, wear and baffle cuts.
Near Field Detection (NFT) technology is a fast, cost-effective solution tailored to the detection of finned carbon steel pipe components. This new technology relies on a simple driver-pickup eddy current probe design that makes signal analysis simple and easy.
NFT technology is particularly suitable for detecting corrosion, erosion or pitting of the inner wall of carbon steel pipe. After the NFT probe measures the liftoff value or "fill factor", this value is converted to a wave-based signal (no phase analysis is required). Since the depth of penetration of the vortex is limited to the inner surface of the pipe, the shape of the fins on the outside of the pipe does not affect the NFT probe.